Re: [ccp4bb] How to express a >95KD FAD protein

2009-07-03 Thread Kn Ly
try codon optimisation use Rosetta 2 strains fuse to MBP I expressed a yeast protein of ~100 KDa, expression was low until I fused it to MBp (resulting protein ~ 150 KDa)

[ccp4bb] off topic

2009-06-18 Thread Kn Ly
Hello everyone, I am trying to purify a 13 KDa membrane protein using Ni NTA. The protein is solubilised in Triton X 100, 20 mM phosphate buffer, 150 mM NaCl and binds very well to the column. However, it also turns the column brownish. The protein contains 4 cysteine residues so I suspect that th

Re: [ccp4bb] Purification

2009-03-22 Thread Kn Ly
Hello everyone, Just want to say thanks for your great ideas and time to reply my question. Hope I will solve my problem soon Kien

[ccp4bb] purification

2009-03-19 Thread Kn Ly
Hello everyone, I am expressing a 100 KDa eukaryotic membrane protein in E coli. The protein is fused to 6His-MBP in the N terminus and the resulting mass is ~ 150 KDa. However, the protein get severely degraded so after putting through a Ni-NTA column, the protein came out with a lot of contamin